Renesas R4F20103NFA#20

Overview

R4F20103NFA#20 from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/Tiny family, designed for embedded control in resource-constrained industrial and consumer systems. It integrates 64 KB on-chip flash memory, 4 KB RAM, a 16-bit CPU core, 10-bit ADC with 8 channels, and supports up to 20 MHz operation at 3.3 V. It is commonly deployed in motor control modules, sensor interface units, and programmable logic controllers requiring deterministic real-time response.

For engineers reviewing the R4F20103NFA#20 datasheet, R4F20103NFA#20 pinout, R4F20103NFA#20 application, or R4F20103NFA#20 equivalent, key selection criteria include its H8S/20103-specific peripheral set (SCI3, IIC2, DTC), 64-pin LQFP package, 3.3 V supply compatibility, and support for on-chip debugging via on-chip debug interface (OCD).

Technical Context

The R4F20103NFA#20 implements the H8S/2000 CPU core with 24-bit address space, supporting advanced mode operation and 16-bit data paths. Its system architecture includes integrated clock pulse generator (CPG) with PLL, bus controller (BSC), and low-voltage detection (LVD) circuitry - enabling robust operation across industrial temperature ranges (−40°C to +85°C).

Peripheral integration includes serial communications interface SCI3 (UART/CLK-synchronous), Inter-IC Bus IIC2 (master/slave), data transfer controller (DTC) for autonomous memory-to-peripheral transfers, and event link controller (ELC) for hardware-triggered interrupt routing - all mapped into fixed memory addresses per the H8S/20103 memory map.

Key Specifications

Pinout & Package

R4F20103NFA#20 is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow the H8S/20103 Group specification, including dedicated reset (RES#), clock input (EXTAL/XTAL), and multiplexed I/O ports (Port 1–Port 9) with configurable pull-up/pull-down and drive strength.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R4F20103NFA#20, R4F20203NFA#20 offers scalable memory for evolving firmware, while HD64F20103F20 trades flexibility for lower unit cost in static production runs - both retain identical timing, I/O behavior, and debug infrastructure.

Availability

R4F20103NFA#20 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic relays, and home appliance UI controllers requiring stable component supply and long-term lifecycle support.

Supply support for R4F20103NFA#20 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The H8S/Tiny series - including R4F20103NFA#20 - was engineered for cost-sensitive, real-time embedded control applications demanding high reliability, low power, and integrated peripherals without external support chips.

FAQ

What is the maximum operating frequency of the R4F20103NFA#20?

The R4F20103NFA#20 operates at a maximum frequency of 20 MHz when supplied with 3.3 V. This frequency is achieved using the on-chip PLL clock pulse generator configured for 1× or 2× multiplication of an external crystal or oscillator input. The device maintains full functionality - including ADC conversion, interrupt latency, and peripheral timing - across the entire rated temperature range (−40°C to +85°C). R4F20103NFA#20 does not support overclocking beyond this specification.

Does the R4F20103NFA#20 support in-system programming (ISP)?

Yes, the R4F20103NFA#20 supports in-application programming (IAP) of its 64 KB on-chip flash memory via the on-chip debug (OCD) interface. Firmware updates can be performed without removing the device from the target board, using standard Renesas Flash Development Toolkit (FDT) or third-party tools compliant with the H8S OCD protocol. R4F20103NFA#20 requires no external high-voltage programming signals - all programming voltages are generated internally.

What debug interface does the R4F20103NFA#20 provide?

The R4F20103NFA#20 features an on-chip debug (OCD) interface compliant with Renesas' single-wire debug standard. It supports full real-time debugging capabilities including breakpoints, watchpoints, register read/write, memory inspection, and flash programming through a 4-pin header (VDD, VSS, TCK, TDI/TDO). No external JTAG emulator is needed - R4F20103NFA#20 integrates all debug logic on-die and operates at the same 3.3 V supply as the application.

Is the R4F20103NFA#20 pin-compatible with other H8S/20xx devices?

R4F20103NFA#20 shares the same 64-pin LQFP package and pin assignment with the H8S/20103 group, including R4F20203NFA#20 and R4F20115NFA#20. However, peripheral enablement, memory size, and clock configuration registers differ between variants - so while PCB layout is reusable, firmware must be validated per specific part number. R4F20103NFA#20 is not pin-compatible with H8S/202x3 or H8S/20115 derivatives outside the H8S/20103 subgroup.

What power supply requirements does the R4F20103NFA#20 have?

The R4F20103NFA#20 requires a single 3.3 V ±0.3 V supply for core and I/O operation, with separate AVCC and DVCC pins decoupled using 0.1 µF ceramic capacitors near the package. It draws 12 mA typical at 20 MHz and drops to 1.5 µA in STOP mode. An external 3.3 V regulator meeting ±3% tolerance and <100 mV ripple is mandatory - R4F20103NFA#20 does not include an internal voltage regulator or support for 5 V operation.